The nomenclature 'GTI' was created back in the 1970s when
Volkswagen launched its sporty version for the compact Golf and called it GTI. The 'GT' stood for a GT car, which of course the Golf has never been. The 'I' stood for the new novelty of '70s passenger cars: fuel injection systems. Later that acronym was used by
Peugeot for a line of hot hatches based on super-mini and compact models such as the 205GTI and the 309GTI.
Suzuki also produced a Swift GTI of its own.